Q.Calla lily house plant
I received a calla lily 3 weeks ago
The flowers are turning brown and drying up. Leaves are looking kinda bent
I water once a week and have put it in a larger pot
Have you any suggestions for helping it along?

It is normal for flowers to fade or turn color as they age. Remove them at this point as you don't want the plant to put energy into making seeds. You want more flowers! Depending on how much bright sunlight the plant gets, you may need supplemental lighting to keep it blooming. The winter sun doesn't pack much punch in the northern half of US. Water to keep the soil moist, not wet. Wiggle your finger an inch deep into the soil and only water if soil is dry at that depth. Use a balanced fertilizer. This article is on growing calla lily indoors: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/container-grown-calla-lilies.htm
Here is a list of other articles on calla lily: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily